This research work was undertaken to study the conversion of tuna processing waste such as head, viscera, flesh and bone into a protein based feed ingredient as a substitute for fish meal in animal feed, to reduce the beach pollution and also easy way of handling of liquid silage. Tuna processing wastes get easily decomposed and cause extreme pollution in landing centres. Preparation of liquid silage was carried out by addition of 3% acid (1:1, Formic: Propionic acid) into crushed tuna processing wastes at pH 4. The liquefaction process was continued for 4 days. The nutritional composition of tuna silage measured as water content of was 64.35% ±0.8, crude protein was 34.97±0.2%, and crude fat was 0.55±0.04%. The moisture content was reduced to 53 ±0.6 by addition of wheat bran and rice bran (1:1) at the rate of 70: 30 w/w. The semisolid silage mixture was dried under the sun for 2 days. The dried silage cake was pulverised and proximate composition determined. Powdered silage had moisture of 10.68±0.09 %, crude protein 57.64 ±0.27%, carbohydrate 11.52 ±0.12%, fat 4.83±0.04% crude fibre 5.74±0.16% and ash content of 8.21±0.06%. The pH was 6.45±0.01. It was comparable to the protein source of commercial feed ingredient used in animal feeds. The digestibility of powdered silage was considered to be better than fish meal due to partial digestion with gut enzymes. The palatability of the powdered fish silage was tested with fish, poultry and dog and found acceptable. This method of conversion of tuna processing waste into animal feed ingredient as a fish meal supplements.